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1, 1, 4, 12, 37, 140, 454, 1566, 5670, 18738, 70800, 263002, 1065240, 4146500, 15269976, 61593260, 233206636, 879932068, 3442083056, 12794936028, 49150133908, 188187379818, 690417160564, 2688772826468, 10355819787218, 42350139855568, 167122149149460
(list;
graph;
refs;
listen;
history;
text;
internal format)
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